Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e5f088ed92b164…

MALICIOUS

PDF

44.6 KB Created: 2020-08-08 05:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27cc2bc6af5079420817923eb8601e74 SHA-1: e1c2dcaefc084473520ecf0cb28de3a094c7b478 SHA-256: d7e5f088ed92b16414be01be5cfa52e635de28cb6bf1ef53400c9ffdd2e2c1a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm for SEO poisoning or phishing. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bullismo+scuola+primaria+pdf. While no scripts were extracted, the sheer volume of embedded links points towards a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=bullismo+scuola+primaria+pdf
    • http://files.rlievents.ca/uploads/1/3/0/8/130874379/suzepisesewek_rezisutuwam.pdf
    • http://files.icpel.org/uploads/1/3/0/7/130739227/sejebalubugur.pdf
    • http://files.youthclimatesummitusa.org/uploads/1/3/0/7/130739802/2253597.pdf
    • http://zabafe.americanacademicconnections.com/uploads/1/3/1/3/131379578/wemegexuvomo-jerekikawuvato-bawenetaduzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/bifafidodoxosadir.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/63869091592.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/11580543803.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/install_opencl_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/vibixefupubewitomef.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/adhd_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0432/6188/6627/files/9575676750.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/aluminium_sulphate_msds.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/daruzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/90654270413.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikoleluvotejagumali.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/55483712871.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fa7.bin
d14ba6d4e8876edd50e3d7bbeb210a769a5c3e5f8777fe3e8b3a9aa8790d47e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA7 5348 bytes
font_01_sfnt_off000081bf.bin
11f176b221ed183f8929d044aeedac33510a582863280a573d0608db4260276a
pdf-font-stream PDF embedded font (sfnt) at offset 0x81BF 11056 bytes